Sonic Alert msm80154s Clock Radio User Manual


 
DESCRIPTION OF INSTRUCTIONS
347
88. RET (Return from subroutine, non interrupt)
00100010
70
Instruction code
Operations
Number of bytes
Number of cycles
Flags
(PSW)
Description
: Byte 1
(PC
8~15)((SP))
(SP)(SP)–1
(PC
0~7)((SP))
(SP)(SP)–1
:
C AC F0 RS1 RS0 OV F1 P
:
:
:
The stack contents addressed by the stack pointer are popped
in the upper order 8 thru 15 of the program counter, and the
stack pointer is decremented by 1. Then the stack contents
addressed by the updated stack pointer are popped in the lower
order 0 thru 7 of the program counter, again decrementing the
stack pointer by 1. The program counter is updated with the
stack contents, and control is shifted to the address after
updating.
:
1
2